The meat you buy is free from antibiotics
Sorry, but the meat you buy in stores is free from antibiotics. While farm animals are fed antibiotics for various reasons, by law the antibiotics must be withdrawn several weeks before the animals are slaughtered. Random samples are taken at the packing plant, and if a farmer's animals have any detectable antibiotic residue in them, then that load gets condemned. In addition the farmer may prohibited from selling more animals for several weeks on the assumption it will take that long to clear any antibiotics out of their systems. Farm animals have a very tight weight "window" they must meet to get top dollar. If a farmer can't sell his animals when they are in that window, their value goes down drastically, so this is a major penalty.
How do I know this? Growing up my family had a hog farm, and this was always a big issue. We had separate antibiotic-free grain that we fed to hogs that were a few weeks away from market. We never let them get into any pens where grain with antibiotics was fed. A single accidental shovel of grain with antibiotics was enough to trigger sanctions against us.
Note that this issue is separate from the much larger controversy over whether antibiotics fed on the farm create superbugs that then spread to humans. If superbugs are created, it happens while the animals are being raised and fed antibiotics.
